Which statement can describe how gravity affects driving?

• A. It always helps you stop
• B. It can work against you or in your favor
• C. It has no effect on motion
• D. It only affects objects in the air

Answer: (B)

Gravity's impact on driving depends on the road's slope and your direction of travel. The car's weight presses the tires into the road, increasing traction for braking and steering, but gravity also changes how fast you move on slopes. Going downhill, gravity pulls you forward along the road, adding to your speed and making it harder to stop. Going uphill, gravity works against your forward motion, helping keep speed down and making acceleration harder. Because of this interplay, gravity can either help you or hinder you, depending on the situation.

This isn’t limited to airborne objects; gravity acts on a car just as it does anywhere else, and it affects motion on the road. It doesn’t always help you stop, and it isn’t something that has no effect on motion.